deps: upgrade V8 to 4.7.80.24

Pick up the latest branch head for V8 4.7:
v8/v8@be169f8

Full change history for the 4.7 branch:
https://chromium.googlesource.com/v8/v8.git/+log/branch-heads/4.7

V8 blog post about what is new on V8 4.7:
http://v8project.blogspot.de/2015/10/v8-release-47.html

PR-URL: nodejs#4106
Reviewed-By: bnoordhuis - Ben Noordhuis <[email protected]>
Reviewed-By: targos - Michaël Zasso <[email protected]>
Reviewed-By: rvagg - Rod Vagg <[email protected]>

Author: ofrobots

deps/v8/.gitignore

@@ -80,6 +80,7 @@ shell_g
 /tools/jsfunfuzz.zip
 /tools/oom_dump/oom_dump
 /tools/oom_dump/oom_dump.o
+/tools/swarming_client
 /tools/visual_studio/Debug
 /tools/visual_studio/Release
 /v8.log.ll

deps/v8/AUTHORS

@@ -49,6 +49,7 @@ Christopher A. Taylor <[email protected]>
 Daniel Andersson <[email protected]>
 Daniel James <[email protected]>
 Douglas Crosher <[email protected]>
+Dusan Milosavljevic <[email protected]>
 Erich Ocean <[email protected]>
 Fedor Indutny <[email protected]>
 Felix Geisendörfer <[email protected]>
@@ -67,6 +68,7 @@ Johan Bergström <[email protected]>
 Jonathan Liu <[email protected]>
 JunHo Seo <[email protected]>
 Kang-Hao (Kenny) Lu <[email protected]>
+Karl Skomski <[email protected]>
 Luis Reis <[email protected]>
 Luke Zarko <[email protected]>
 Maciej Małecki <[email protected]>
@@ -90,9 +92,11 @@ Rene Rebe <[email protected]>
 Robert Mustacchi <[email protected]>
 Robert Nagy <[email protected]>
 Ryan Dahl <[email protected]>
+Sakthipriyan Vairamani (thefourtheye) <[email protected]>
 Sandro Santilli <[email protected]>
 Sanjoy Das <[email protected]>
 Seo Sanghyeon <[email protected]>
+Stefan Penner <[email protected]>
 Tobias Burnus <[email protected]>
 Victor Costan <[email protected]>
 Vlad Burlik <[email protected]>